Question

What is the sum of the series below?


6
∑(7i-2)
i=1

Answer 1

135

Answer 2

how did you get that answer?

Answer 3

evaluate for each value of i and add

Answer 4

(7-2)+(14-2)+(21-2)+(28-2)+(35-2)+(42-2)

Answer 5

6
∑(7i-2) = (7(1) - 2) + (7(2) - 2) + (7(3) - 2) + (7(4) - 2)+ (7(5) - 2) + (7(6) - 2)
i = 1

Answer 6

there is a formula you can use to calculate this but don't expect to have to do this very much so the formulas are more of a novelty usually at least they were for me